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Advances in Nano Research Volume 8, Number 4, May 2020 , pages 283-292 DOI: https://doi.org/10.12989/anr.2020.8.4.283 |
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Scale-dependent thermal vibration analysis of FG beams having porosities based on DQM |
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Raad M. Fenjan, Nader M. Moustafa and Nadhim M. Faleh
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| Abstract | ||
| In the present research, differential quadrature (DQ) method has been utilized for investigating free vibrations of porous functionally graded (FG) micro/nano beams in thermal environments. The exact location of neutral axis in FG material has been assumed where the material properties are described via porosity-dependent power-law functions. A scale factor related to couple stresses has been employed for describing size effect. The formulation of scale-dependent beam has been presented based upon a refined beam theory needless of shear correction factors. The governing equations and the associated boundary conditions have been established via Hamilton's rule and then they are solved implementing DQ method. Several graphs are provided which emphasis on the role of porosity dispersion type, porosity volume, temperature variation, scale factor and FG material index on free vibrational behavior of small scale beams. | ||
| Key Words | ||
| free vibrations; thermal effects; porosity; FG beam; modified couple stress theory | ||
| Address | ||
| Al-Mustansiriah University, Engineering Collage P.O. Box 46049, Bab-Muadum, Baghdad 10001, Iraq. | ||